restricts when context could be retrieved.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 6b13936bdc5e043c791bc04f86245158f5a11983..02553a4fb6d71e708d734615f783835557dbbd9a 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -80254,6 +80254,21 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="VoiceInteraction.IllegalContextRequest" enum="BooleanHit">
+  <owner>muyuanli@chromium.org</owner>
+  <summary>
+    Counts the number of requests to retrieve voice interaction context when no
+    user interaction is initiated.
+  </summary>
+</histogram>
+
+<histogram name="VoiceInteraction.UserInteractionToRequestArrival" units="ms">
+  <owner>muyuanli@chromium.org</owner>
+  <summary>
+    Records the time between user interaction and the actual request arrival.
+  </summary>
+</histogram>
+
 <histogram name="VRDisplayPresentResult" enum="PresentationResult">
   <owner>billorr@chromium.org</owner>
   <summary>